50 home runs (HR) have been hit 43 times with some players doing it multiple times. In 1938 Jimmie Foxx hit 70% of his 50 HR at home in Fenway Park in Boston. This was two years before the Red Sox created bullpens in right center after the 1939 rookie season of Ted Williams, which brought in the fence. Foxx was a right handed batter so the closer fence in right center may not have helped him but it did help lefty David Ortiz who broke the Red Sox record set by Foxx when Ortiz hit 54 HR in 2006. However, Ortiz hit only 40.7% of his HR in Fenway Park. That's the third lowest 50 HR home percent.

Perhaps even more counterintuitive was the bottom guy: Brady Anderson who hit only 38% at home in what most people think is an easy HR park: Oriole Park at Camden Yards in Baltimore.

Another surprise was Willie Mays hitting only 43.1% in the Polo Grounds in New York in 1955.